Characterization of low-glycosylated forms of soluble human urokinase receptor expressed in Drosophila Schneider 2 cells after deletion of glycosylation-sites
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Characterization of low-glycosylated forms of soluble human urokinase receptor expressed in Drosophila Schneider 2 cells after deletion of glycosylation-sites. / Gårdsvoll, Henrik; Werner, Finn; Søndergaard, Leif; Danø, Keld; Ploug, Michael.
I: Protein Expression and Purification, Bind 34, Nr. 2, 2004, s. 284-295.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Characterization of low-glycosylated forms of soluble human urokinase receptor expressed in Drosophila Schneider 2 cells after deletion of glycosylation-sites
AU - Gårdsvoll, Henrik
AU - Werner, Finn
AU - Søndergaard, Leif
AU - Danø, Keld
AU - Ploug, Michael
PY - 2004
Y1 - 2004
N2 - The urokinase-type plasminogen activator receptor (uPAR) is a glycolipid-anchored membrane protein that is thought to play an active role during cancer cell invasion and metastasis. We have expressed a truncated soluble form of human uPAR using its native signal peptide in stably transfected Drosophila Schneider 2 (S2) cells. This recombinant product, denoted suPAR (residues 1-283), is secreted in high quantities in serum-free medium and can be isolated in very high purity. Characterization by SDS-PAGE and mass spectrometry reveals that suPAR produced in this system carries a uniform glycosylation composed of biantennary carbohydrates. In contrast, suPAR produced in stably transfected Chinese hamster ovary (CHO) cells carries predominantly complex-type glycosylation and exhibits in addition a site-specific microheterogeneity of the individual N-linked carbohydrates. Measurement of binding kinetics for the interaction with uPA by surface plasmon resonance reveals that S2-produced suPAR exhibits binding properties similar to those of suPAR produced by CHO cells. By site-directed mutagenesis we have furthermore removed the five potential N-linked glycosylation-sites either individually or in various combinations and studied the effect thereof on secretion and ligand-binding. Only suPAR completely deprived of N-linked glycosylation exhibits an impaired level of secretion. All the other mutants showed comparable secretion levels and retained the ligand-binding properties of suPAR-wt. In conclusion, stable expression of suPAR in Drosophila S2 cells offers a convenient and attractive method for the large scale production of homogeneous preparations of several uPAR mutants, which may be required for future attempts to solve the three-dimensional structure of uPAR by X-ray crystallography.
AB - The urokinase-type plasminogen activator receptor (uPAR) is a glycolipid-anchored membrane protein that is thought to play an active role during cancer cell invasion and metastasis. We have expressed a truncated soluble form of human uPAR using its native signal peptide in stably transfected Drosophila Schneider 2 (S2) cells. This recombinant product, denoted suPAR (residues 1-283), is secreted in high quantities in serum-free medium and can be isolated in very high purity. Characterization by SDS-PAGE and mass spectrometry reveals that suPAR produced in this system carries a uniform glycosylation composed of biantennary carbohydrates. In contrast, suPAR produced in stably transfected Chinese hamster ovary (CHO) cells carries predominantly complex-type glycosylation and exhibits in addition a site-specific microheterogeneity of the individual N-linked carbohydrates. Measurement of binding kinetics for the interaction with uPA by surface plasmon resonance reveals that S2-produced suPAR exhibits binding properties similar to those of suPAR produced by CHO cells. By site-directed mutagenesis we have furthermore removed the five potential N-linked glycosylation-sites either individually or in various combinations and studied the effect thereof on secretion and ligand-binding. Only suPAR completely deprived of N-linked glycosylation exhibits an impaired level of secretion. All the other mutants showed comparable secretion levels and retained the ligand-binding properties of suPAR-wt. In conclusion, stable expression of suPAR in Drosophila S2 cells offers a convenient and attractive method for the large scale production of homogeneous preparations of several uPAR mutants, which may be required for future attempts to solve the three-dimensional structure of uPAR by X-ray crystallography.
KW - Animals
KW - CHO Cells
KW - Cells, Cultured
KW - Cricetinae
KW - Cricetulus
KW - Drosophila
KW - Female
KW - Glycosylation
KW - Humans
KW - Mass Spectrometry
KW - Mutagenesis, Site-Directed
KW - Protein Binding
KW - Receptors, Cell Surface
KW - Receptors, Urokinase Plasminogen Activator
KW - Recombinant Proteins
KW - Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
KW - Surface Plasmon Resonance
KW - Urokinase-Type Plasminogen Activator
KW - Journal Article
KW - Research Support, Non-U.S. Gov't
U2 - 10.1016/j.pep.2003.12.002
DO - 10.1016/j.pep.2003.12.002
M3 - Journal article
C2 - 15003263
VL - 34
SP - 284
EP - 295
JO - Protein Expression and Purification
JF - Protein Expression and Purification
SN - 1046-5928
IS - 2
ER -
ID: 178216120